Electric-arc lamp



(No Mode1.\y

- C. S. VAN NUIS. ELECTRIC ARG LAMP.

Patented Oct. 5, 1897.

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`UNirnD STATES PATENT OFFICE.

CHARLES `S. VAN NUIS, OF NEW BRUNSVICK, NEW JERSEY.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 591,026, dated October 5, 1897. Application nea May 1, i896. sam No. 539,924. (No model.)

To @ZZ whom it' may cow/cern.-

Be it known that I, CHARLES S. V AN NUIs, a citizen of the United States, residing at New Brunswick, in the county of Middlesex and State of New Jersey, have invented a certain new and useful Improvement in Electric-Arc Lamps, of which the following is a specification.

My invention relates to the transparent or translucent globes employed in electric-arc lamps for inclosing the arc to increase the life of the carbons and has special reference to the manner in which such globes are supported 'and the means for preventing the ventrance of air to the inclosing globe and the l escape of gases from within the same, and to means for permitting the automatic adjustment of the globe.

My invention is illustrated in the accompanying drawings, in whichy Figure lis an elevation of an arc-lamp with my improved inclosin g globe applied thereto. Fig. 2 is a central section, on an ,enlarged scale, of a cap'for the top ofthe globe, through which the positive carbon passes; and Fig. 3 is a central section and partial elevation, on an enlarged scale, of the negative carbon, the collar at the lower end of the'inclosing globe, and the base upon which this collar rests.

Referring to the drawings, A and B represent the positive and negative carbons, re-

spectively, of any form of arc-lamp7 and C the transparent or translucent inclosing globe. cap D, containing a number of chambers, three being shown andrmarked CZ', (Z2, and d3. These chambers are preferably formed by constructing the cap in several circular cupshaped parts having ilanges d4, to which the successive parts forming the cap are screwed, as illustrated in Fig. 2. The top of each section of the cap is provided with a vent-hole which is normally closed by any suitable form of valve, a ball as' being shown and contained within a perforated shell m2. Each section of the cap is also provided with a central opening y, through which thecarbon A passes, and these openings are of such diameter that the carbon A will fit as tightly as is consistent with the proper feeding of the carbon, the object of the close fit being to make At the top of this globe is placed a the cap as air-tight as practicable to prevent the entrance of air into the inclosing globe C.

The inclosing globe C at its bottom is. provided with a neck c, which is inserted in a collar E and made air-tight by a packing e, of abestos or other heat-resisting material, and the collar E is clamped to the neck c by several screws e. The collar E is provided With a bottom e2, having a central opening e3 of such diameter as t0 allow the holder of the carbon B to pass therethrough with considerable clearance. The lower end of the collar E is provided with a circular flange e4, Whose inner surface e5 is concaved, and this concaved surface fits 'closely upon a circular base E, having a convex periphery of such curvature as to'form a close and practically airtight joint with the concave surface e5 of the Aflange e4. These two surfaces are preferably ground together to make atrue and tight-fitting joint. This base F is carried bythe carbon-holder B and, if desired," may befmade integral therewith. It will be seen that the base E and flange e4 form a ball-and-socket joint, Which permits the movement of the globe C, while at the same time maintaining a practically air-tight joint. '[his form of base for the globe C permits of a very close-fitting base D, through which the carbon A passes, and if for any reason the carbon A should move out of its longitudinal center or should there be any tendency of the carbon to bind from any rcause the globe O is free to move with it, thus preventing or greatly reducing any binding action between that carbon and the cap D.

The obj ect of providing the cap with the sev* eral chambers d', dro. is to dilute the air which may enter with the gases that escape from the globe C, and thus prevent the entrance of air into the inclosing globe C. To make this more clear, let it be supposed that the gases formed Within the globe C escape around the carb'on A through the opening y and through opening m of section d of the cap into the first chamber d. The gases will become diluted with the air in that chamber, and the diluted gases yescaping from chamber d' into chamber d2 Will become diluted with the airtherein, the resulting mixture of air and gases be# ing less dense than that in chamber d. The

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diluted gases escaping from chamber (Z2 into chamber d3 will become diluted with the air therein, and the resulting mixture vof air and gases will be less dense than thatin chamber d?. Thus it will be seen that the air entering the chambers becomes so diluted with the gases therein that practically no air will enter the globe C. The valves are provided to permit the escape of the gases first from the inclosing globe C and then from the chambers d', duc., when the pressure becomes too high.

What I claim isl. In an arc-lamp,'the combination with the carbons, of an inclosing globe for the arc, having an aperture through which a carbon passes with a practically air-tight fit, and an adjustable and practically air-tight joint for said globe where the other carbon enters and whereby the globe is free to adjust itself relative to the carbons While maintaining said last-named joint air-tight, substantially as set forth.

y 2. In an arc-lamp, the combination with the carbons, of an in closing globe for the are, havin g an aperture through which a carbon passes with a practically air-tight fit, and a practically air-tight ball-and-socketjoint for said globe where the other carbon enters and whereby the globe is free to adjust itself relative to the carbons while maintaining said last-named joint air-tight, substantially as set forth.

3. In an arc-lamp, the combination with the carbons, of an inclosing globe for the arc, having an aperture through whichacarbon passes with a practically air-tight fit, a base carried by the lower carbon-holder, and a collar at the lower end of said globe seated on said base to support the globe, said base and collar forming a practically air-tight ball-and-socket joint, which joint permits the globe to adjust itself relative to the carbons while maintaining the joint air-tight, substantially as set forth.

4. In an arc-lamp, the combination with the carbons, of an inc'losing globe for the arc, acap at one end of the globe provided with an aperture through which a carbon passes with a practically air-tight fit, and an adjustable and practically air-tight joint at the other end of the globe where the second carbon enters, and which joint permits the globeto adjust itself relative to the carbons While maintaining the joint air-tight, substantially as set forth.

5. In an arc-lamp, the combination with the carbons, of an inclosin g globe for the arc having two or more chambers at one end thereof, and provided with apertures through which a carbon passes with a practically air-tight fit, a valve for permitting the escape of gas from the inclosing globe into the adjacent chamber when the pressure becomes too high, and valves for each chamber permitting the escape of gas to successive chambers and to the exterior of the last chamber, substantially as set forth.

6. In an arc-lamp, the combination with the carbons, of an inclosing globe for the arc, a cap for said globe provided with two or more chambers having apertures through which a carbon passes with a practically air-tight fit, and Valves foi1 each chamber permitting the escape of gases to successive chambers and to the exterior of the cap, substantially as set forth.

7. In an arc-lamp, the combination with the l carbons, of an inclosin g globe, and a cap therefor through which one of the carbons passes, said cap consisting of several circular cupshaped parts screwed together to form separate chambers having central openings in the Vwalls thereof for the carbon, and valves for each chamber, substantially as set forth.

This specification signed and witnessed this 24th day of April, 1896.

CHARLES S. VAN NUIS.

Titnessesz EUGENE CONRAN, JOHN R. TAYLOR. 

